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import {isDarkTheme} from '../utils.js';
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import {makeCodeCopyButton} from './codecopy.js';
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import {displayError} from './common.js';
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const {mermaidMaxSourceCharacters} = window.config;
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// margin removal is for https://github.com/mermaid-js/mermaid/issues/4907
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const iframeCss = `:root {color-scheme: normal}
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body {margin: 0; padding: 0; overflow: hidden}
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#mermaid {display: block; margin: 0 auto}
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blockquote, dd, dl, figure, h1, h2, h3, h4, h5, h6, hr, p, pre {margin: 0}`;
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export async function renderMermaid() {
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const els = document.querySelectorAll('.markup code.language-mermaid');
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if (!els.length) return;
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const {default: mermaid} = await import(/* webpackChunkName: "mermaid" */'mermaid');
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mermaid.initialize({
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startOnLoad: false,
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theme: isDarkTheme() ? 'dark' : 'neutral',
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securityLevel: 'strict',
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});
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for (const el of els) {
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const pre = el.closest('pre');
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if (pre.hasAttribute('data-render-done')) continue;
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const source = el.textContent;
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if (mermaidMaxSourceCharacters >= 0 && source.length > mermaidMaxSourceCharacters) {
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displayError(pre, new Error(`Mermaid source of ${source.length} characters exceeds the maximum allowed length of ${mermaidMaxSourceCharacters}.`));
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continue;
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}
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try {
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await mermaid.parse(source);
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} catch (err) {
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displayError(pre, err);
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continue;
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}
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try {
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// can't use bindFunctions here because we can't cross the iframe boundary. This
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// means js-based interactions won't work but they aren't intended to work either
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const {svg} = await mermaid.render('mermaid', source);
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const iframe = document.createElement('iframe');
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iframe.classList.add('markup-render', 'tw-invisible');
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iframe.srcdoc = `<html><head><style>${iframeCss}</style></head><body>${svg}</body></html>`;
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const mermaidBlock = document.createElement('div');
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mermaidBlock.classList.add('mermaid-block', 'is-loading', 'tw-hidden');
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mermaidBlock.append(iframe);
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const btn = makeCodeCopyButton();
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btn.setAttribute('data-clipboard-text', source);
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mermaidBlock.append(btn);
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const updateIframeHeight = () => {
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iframe.style.height = `${iframe.contentWindow.document.body.clientHeight}px`;
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};
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// update height when element's visibility state changes, for example when the diagram is inside
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// a <details> + <summary> block and the <details> block becomes visible upon user interaction, it
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// would initially set a incorrect height and the correct height is set during this callback.
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(new IntersectionObserver(() => {
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updateIframeHeight();
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}, {root: document.documentElement})).observe(iframe);
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iframe.addEventListener('load', () => {
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pre.replaceWith(mermaidBlock);
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mermaidBlock.classList.remove('tw-hidden');
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updateIframeHeight();
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setTimeout(() => { // avoid flash of iframe background
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mermaidBlock.classList.remove('is-loading');
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iframe.classList.remove('tw-invisible');
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}, 0);
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});
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document.body.append(mermaidBlock);
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} catch (err) {
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displayError(pre, err);
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}
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}
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}
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